<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/logo.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主体区域-->
        <el-container>
            <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px' : '200px'">
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <!-- 侧边栏菜单区 -->
            <el-menu :unique-opened = 'true' background-color="#333744" text-color="#fff" 
            active-text-color="#409eef" :collapse = "isCollapse" :collapse-transition = 'false'
            router :default-active = activePath>
                <!-- 一级菜单 -->
                <el-submenu :index="item.id + ''" v-for="item in menuList" 
                :key="item.id" >
                    <!-- 一级菜单模板区域 -->
                    <template slot="title">
                        <!-- 图标 -->
                    <i :class="iconsObj[item.id]" ></i>
                        <!-- 文本 -->
                    <span>{{item.authName}}</span>
                    </template>
                    <!-- 二级菜单 -->
                     <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
                     :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                          <template slot="title">
                        <!-- 图标 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文本 -->
                        <span>{{subItem.authName}}</span>
                    </template>
                     </el-menu-item>
                </el-submenu>
    </el-menu>

        </el-aside>
        <!-- 主体区 -->
        <el-main>
            <!-- 路由占位符 -->
            <router-view> </router-view>
        </el-main> 
    </el-container>
    </el-container>
 
</template>

<script>
export default {
    data (){
        return {
            //左侧菜单数据
            menuList: [],
            iconsObj:{
                '125': 'iconfont icon-user',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-3702mima',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao'

            },
            //是否折叠
            isCollapse: false,
            activePath: '',
        }
    },
    created() {
        this.getMenuList();
        this.activePath = window.sessionStorage.getItem('activePath')
    },
   methods: {
       logout(){
           window.sessionStorage.clear();
           this.$router.push("/login");
       },
       async getMenuList(){
          const {data : res} = await this.$http.get('menus')
          if(res.meta.status !== 200) return this.$message.error((res.meta.msg));
          this.menuList = res.data;
          //console.log(res);
       },
       //点击按钮，切换菜单的折叠与展开
       toggleCollapse (){
           this.isCollapse = !this.isCollapse;
       },
       //保存链接的激活状态
       saveNavState(activePath){
           window.sessionStorage.setItem('activePath',activePath);
           this.activePath = activePath;    
       }
   }
}
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}
.el-header {
    background-color: #373d41;
    display: flex;
    padding: 0;
    justify-content: space-between;
    img {
        width: 50px;
        height: 50px;
    }
    > div{
        display: flex;
        align-items: center;
         span {
            margin-left: 15px;
        }
    }
    align-items: center;
    color: #fff;
    font-size: 20px;
    
}

.toggle-button{
    background-color:  #4a5064;
    color: #fff;
    font-size: 10px;
    line-height: 24px;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
.el-aside {
    background-color: #333744;
   .el-menu{
        border-right: none;
   } 
}
.el-main {
    background-color: #eaedf1;
}
.iconfont {
    margin-right: 10px;
}



</style>